Mixing machine discharge door



June 1953 A. c. CHRISTENSEN 2, 87

MIXING MACHINE DISCHARGE DOOR Original Filed Feb. 27, 1947 2Sheets-Sheet 1 271 75 TiZUT J1me 1953 A. c. CHRISTENSEN 2,641,337

MIXING MACHINE DISCHARGE DOOR Original Filed Far 27, 1947 2 Sheets-Sheet2 4 I ii :4 Z r I 2 a6 a; 25 25 25 I IN 27 I 1 55 UL &

Patented June 9, 1953 2,641,387 MAQHINE D993 7 Alfred G. Ghristensen,Chicago, 111., assignor, by

mesne assignments, to Herbert Simpson poration, Chicago, 111., acorporation of Illinois Origbml pn a ioni br aiw 27,. .1941.q :SerialNo- 7.3L.2l3 Div ded and this app ation October. 6, 1.951, SerialNo.250,168

- This invention relates to a mixing machinedischarge door, and moreparticularly to such a door which swings the plane of the doorbetween-open and closed position.

' The discharge door oi the present invention is particularly suited foruse the material mixer disclosed in my copendin-g application ontitledIntensive Mixin Apparatus, Serial No. 731,213, filed February 2'1,19457, of which the present application is a division.

An important object of the present invention is to provide a noveldischarge door fora mixer.

'It is another object of the present inventionto DIGVTME a dischargedoor that is leak-proof and self-cleaning.

It is a further object of the present invention to provide a dischargewhich does not'req-uire a latch or locking device.

A feature of the present invention is the provision of a discharge-doorthat-is leak-proof and self-cleaning due to a sliding action between thedoor and the bedplatc of the mixing machine.

Other ob l'ects.,,-featuznes and adelamtages of the present. inventionwill be apparent to those. skilled in .the art from the followindetailed description of the annexed drawings, which. by wayof preierredexample only, illustrateone embodiment of the. invention.

in the drawings;

Figure 1 is a plan view of a mixing machine having a discharge dooraccording to this invention;

Figure 2 is a vertical sectim'ial 'YiBW taken Substantially along theline IIII of Figure 1; and

Figure 3 is a partial enlarged vertical sectional view takensubstantially along the lines III--III of Figure 1.

As shown in the drawings:

In Figures 1 and 2, a pair of muller wheels l0, an outside plow ll, aninside plow l2, and a scraper [3 are secured to a cross-head M forrotation by a drive shaft I5 in a crib It. The drive shaft l'5 is drivenfrom an electric motor I? through a gear reducer l8, which driving unitsare disposed in a base frame [9. The motor I! is also adjustably mountedby means of a cross member on the base frame IS.

The base frame I9 is substantially a box-like structure preferably madeof steel having walls thick enough to support the entire weight of themounting and mechanism there-above, including a bedplate 2| which issecured to the top surface of the frame is by means of a plurality ofbolts 22. The bedplate 2| has a substantially rectangular shape at thebottom to conform to the shape of the base frame 1 9 but at the-rippersides the bedplatehas a substantially circular shape for supporting awear plate '23 and the. crib $6 or mixing machine. The 1 5 and wearplate. or bottom 23' thus define a mulling chamber. The crib #6 has avertical wall 24 and the bottom 23 has a topsurface 25 on which materialis. pro gressively mu li ed. The bottom 2:3 is. provided with adischarge opening adjacent the chamber wall 24 and defined on itsinnermost side by a ci mular edge 2 6 facin the Walt.

J Provision is made for removing the materi'ai in the crib in the formofa closure door 21 winch is substantialty a semi-circular platecorresponding to the shape ot the discharge opening. As

shown- Figure 3, the outer circular edge- 28 of the plate 21' has a stepconstrudtion 249! is. adapted to fit in sliding" contact over a.complementall step construction 300i the wear plate 2:3 for sealingengagement the. edge. 2% of the. opening "The: cl'esure door ismdvable ahorizontal plane into the opening its: top surface at alignment: withthe top. surface $25 of :theibottom .231todeiime-th wear surface. of themulling chamber. construction. renders the door leak-proof when closed.

Th discharge door 21: is: secured to. its inner:

end to. a. substantially cylindrical: member 32; in close. proximity tochamber bottom 13.. The member 32 is arranged for pivoting in a supporthousing. 33 projecting; from the side of thecrib 3* and rigidlyfastenedthereto by welding. door is supported by! a. bolt 3d disposed in. acentral aperture inalih upper part oi the upport housing 33 andprojecting downwardly through an opening in the cylindrical member 32 tobe secured at the bottom by a nut 35. A handle member 36 has a reducedportion 31 which is adapted to pivot in a slot 38 of the support housing33. The inner end of the handle 36 is arranged to screw into thecylindrical member 32.

Thus, the discharge door 21 may be pivoted upon the bolt 34 by means ofthe handle 36 which is free to swing in the slot 38. It is to beparticularly noted in Figure 2 that this type of door provides a maximumamount of space below the crib which may be advantageously used toposition a receptacle under the discharge door 21.

As the discharge door 21 is swung open to the position indicated indot-dash outline in Figure 1 at 21a, any material clinging to the uppersurface thereof will be scraped off by the lower inner edge of the cribI6 since the door is swung in close contact thereunder. Thus, thisdischarge door 21 is substantially self-cleaning.

A discharge chute 39 of any suitable configuration may be secured to thebedplate 2| under the discharge door 21.

The mixing machine of this invention is put in operation by placing thematerial to be mixed in the crib. l6 andthen starting the motor l1. Thedrive'shaft I will then begin to rotate the plows, the scraper and themullers in the crib. The outer plow II is adapted to take the materialat the outer rim of the crib and move it inwardly into the path of themullers and the inner plow I2 is advantageously disposed to take any,

material which is near the center of the crib and move it outwardly intothe path of the mullers. The scraper l3, will remove all the materialfrom the side wall of the crib. Due to the fact that the mullers arepivotally mounted on their arms, the muller is free to knead and workthe mixture by exerting a force thereon in direct proportion.

to the weight of the muller. The tumbling action of the plow and thekneading action of the mullers is such that tough plastic mixture willresult without any damage being done to the grain structure of thematerials being mixed.

When it is desired to remove the mixture from the crib, the door 21 isswung about the bolt 34 to allow the mixture to be discharged throughthe opening provided in the wear plate and in the bedplate. 1

For further details in the construction and operation of the mixingmachine herein disclosed, reference is made to my copending applicationentitled Intensive Mixing Apparatus, Serial No. 731,213, filed February27, 1947, of which the present application is a division.

It is to be understood that various details of construction may bevaried through a wide range without departing from the principles ofthis invention, and it is, therefore, not the purpose to limit thepatent granted hereon otherwise than necessitated by the scope of theappended claims.

I claim as my invention:

1. A discharge door for a mixing machine having a base, a crib supportedon the base, a wear plate supported by said base and forming the bottomof the crib, the wear plate having a sectoral-shaped opening defining astepped discharge opening; comprising a door member for mounting on saidcrib and swingable in a plane parallel to the plane of said wear plate,said door member being of sectoral-shape for movement into said openingin said wear plate to close said discharge opening, said door memberhaving a stepped outer edge for extending in overlapping relation to theedge of said wear plate opening to form a leak-proof joint when saiddischarge opening is closed.

2. In combination for a mixing machine of the type having a crib; a wearplate defining the bottom of said crib and having a stepped edgedefining a. discharge port, and a discharge door of thicknesscorresponding to that of the wear plate mounted on said crib andswingable in a plane parallel to the plane of said wear plate, saiddischarge door being of a similar shape to said port and being movableinto said port in said wear plate to close said discharge port, saiddischarge door having a stepped outer edge disposed in over-lappingrelation to the edge of said wear plate to form a leak-proof joint whensaid discharge port is closed with the surfaces of said discharge doorflush with the surfaces of said wear plate.

3. A discharge door for a mulling machine including a. crib, comprisinga tubular support housing mounted at the side of said crib, a sleevemember journaled in said housing member and depending therefrom, a boltextending centrally through said sleeve member and through an upper Wallof said housing for supporting said sleeve member in said housing, ahandle member connected with said sleeve member and extending throughsaid support housing, said support housing having a generally horizontalslot accommodating horizontal movement of said handle member to pivotsaid sleeve member in said housing, a discharge door member of generallysectoralshape secured at its inner end to said sleeve member below saidsupport housing, said door member having a stepped outer arcuate edgefor overlapping engagement with the bottom of said crib to close anopening therein.

ALFRED C. CHRISTENSEN.

References Cited in the file of this patent UNITED STATES PATENTSFOREIGN PATENTS Country Date Switzerland Mar. 12, 1945 Number Number

